<template>
  <!-- <transition name="todo" appear=""> -->
  <li>
    <label>
      <!-- :checked="true/false"可以控制复选框是否选上 -->
      <input
        type="checkbox"
        :checked="todo.completed"
        @change="handleCheck(todo.id)"
      />
      <!-- 此行代码能实现与上述代码相同的功能,但是不推荐,因为改变了props违反了原则 -->
      <!-- <input type="checkbox" v-model="todo.completed" /> -->
      <span v-show="!todo.isEdit">{{ todo.title }}</span>
      <input
        type="text"
        v-show="todo.isEdit"
        :value="todo.title"
        @blur="handleBlur(todo, $event)"
        ref="inputTitle"
      />
    </label>
    <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
    <button
      v-show="!todo.isEdit"
      class="btn btn-edit"
      @click="handleEdit(todo)"
    >
      编辑
    </button>
  </li>
  <!-- </transition> -->
</template>

<script>
import pubsub from "pubsub-js";

export default {
  name: "TextItem",
  // 声明接收todo
  props: ["todo"],
  methods: {
    handleCheck(id) {
      // this.checkTodo(id);
      this.$bus.$emit("checkTodo", id);
    },
    //删除
    handleDelete(id) {
      if (confirm("确定删除吗？")) {
        //通知App组件将对应的todo对象删除
        // this.deleteTodo(id);
        // this.$bus.$emit("deleteTodo", id);
        pubsub.publish("deleteTodo", id);
      }
    },
    handleEdit(todo) {
      // hasOwnProperty判断方法是否具有这个属性
      if (todo.hasOwnProperty("isEdit")) {
        todo.isEdit = true;
      } else {
        this.$set(todo, "isEdit", true);
      }
      // 定时器实现延迟
      // setTimeout(() => {
      //   this.$refs.inputTitle.focus();
      // }, 200);

      // nextTick解析完DOM元素再来执行以下的代码
      this.$nextTick(function () {
        this.$refs.inputTitle.focus();
      });
    },
    handleBlur(todo, e) {
      todo.isEdit = false;
      if (!e.target.value.trim()) return alert("输入不能为空！");
      this.$bus.$emit("updateTodo", todo.id, e.target.value);
    },
  },
};
</script>

<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}
li:hover {
  background-color: #ddd;
}
li:hover button {
  display: block;
}
/* .todo-enter-active {
  animation: show 0.5s;
}
.todo-leave-active {
  animation: show 0.5s reverse;
}
@keyframes show {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
} */
</style>